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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?

A) Nothing
B) markdown
Inner class:
------------
Outer field
C) An exception is thrown at runtime.
D) Compilation fails at line n2.
E) Compilation fails at line n1.

2. How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?

A) None of the suggestions.
B) var concurrentHashMap = new ConcurrentHashMap();
C) var concurrentHashMap = new ConcurrentHashMap(42, 10);
D) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
E) var concurrentHashMap = new ConcurrentHashMap(42);

3. Given:
java
ExecutorService service = Executors.newFixedThreadPool(2);
Runnable task = () -> System.out.println("Task is complete");
service.submit(task);
service.shutdown();
service.submit(task);
What happens when executing the given code fragment?

A) It prints "Task is complete" once, then exits normally.
B) It prints "Task is complete" twice, then exits normally.
C) It exits normally without printing anything to the console.
D) It prints "Task is complete" once and throws an exception.
E) It prints "Task is complete" twice and throws an exception.

4. What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}

A) It throws an exception
B) PT0D
C) PT0H
D) PT6H
E) Compilation fails

5. Given:
java
DoubleStream doubleStream = DoubleStream.of(3.3, 4, 5.25, 6.66);
Predicate<Double> doublePredicate = d -> d < 5;
System.out.println(doubleStream.anyMatch(doublePredicate));
What is printed?

A) false
B) An exception is thrown at runtime
C) 3.3
D) true
E) Compilation fails

Solutions: